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onsemi 1N6277A
- Part No.:
- 1N6277A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6277A.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,193
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Product details
Overview
1N6277A from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning surges, and inductive switching transients. It features a working peak reverse voltage of 15.3 V, clamps at ≤25.2 V under 59.5 A peak pulse current, and delivers sub-1 ns response time with <5 µA leakage above 10 V.
For engineers reviewing the 1N6277A datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM compatibility with 12–15 V DC rails, VC margin relative to IC absolute maximum ratings, UL 497B certification for isolated loop protection, and axial leaded Surmetic package suitability for through-hole surge protection in power supplies and industrial controls.
Technical Context
The 1N6277A operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its 17.1–18.9 V breakdown range (VBR @ IT = 1 mA). Its low dynamic impedance ensures stable clamping during 1 ms 1500 W pulses, while thermal resistance of 20 °C/W (RJL) supports reliable power dissipation at lead temperatures ≤75 °C.
Designed for unidirectional protection only, it exhibits no forward conduction beyond standard diode behavior (VF ≤3.5 V @ 100 A), lacks bidirectional symmetry, and requires cathode-band orientation in-circuit. Its 0.088 %/°C VBR temperature coefficient enables predictable voltage drift across −65 to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 15.3 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Clamping Voltage (VC) | 25.2 V @ 59.5 A IPP - maximum voltage seen by protected circuit during worst-case surge |
| Breakdown Voltage (VBR) | 17.1–18.9 V @ 1 mA - precise Zener threshold defining turn-on onset |
| Leakage Current (IR) | <5 µA @ 15.3 V - negligible standby power loss and signal interference |
| Response Time | <1 ns - limits voltage overshoot during fast-rising transients (e.g., ESD) |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 immunity requirements |
Pinout & Package
1N6277A uses an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a polarity band. Leads are tin-plated, solderable at 230 °C for 10 seconds at 1/16″ from case. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point in protected circuit |
| Cathode | High-side clamping node | Connected to line being protected; polarity band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGV2) | Validated for isolated loop circuit protection per safety standard - eliminates need for separate certification testing |
| 1500 W Peak Pulse Rating | Handles 8.3 ms half-sine surges up to 200 A without degradation - suitable for telecom and industrial AC line protection |
| Pb-Free External Lead Finish | Complies with RoHS Directive 2011/65/EU - enables drop-in replacement in legacy and new designs |
| Low Zener Impedance | Minimizes VC rise under high di/dt - critical for protecting 3.3 V and 5 V logic interfaces from overshoot |
Applications
| Industrial Power Supply Input Protection | RS-485 Communication Line Clamping |
|---|---|
Use Scenario: 24 V DC input stage of PLC power module exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input terminals to clamp transients before they reach upstream regulators and controllers. Use Value: 15.3 V VRWM matches nominal 24 V rail derating margin; 25.2 V VC ensures downstream 30 V-rated MOSFETs remain within safe operating area. |
Use Scenario: Differential data lines in factory-floor RS-485 network subject to ground potential differences and ESD events. IC Role / Device Role / Timing Role: One 1N6277A per line (A and B), cathode-to-line, anode-to-ground - provides asymmetrical overvoltage clamping. Use Value: Sub-1 ns response prevents data corruption during 15 kV contact discharge; UL 497B approval supports certified isolation barrier compliance. |
| Medical Equipment AC/DC Adapter Interface | Automotive Body Control Module (BCM) Sensor Inputs |
Use Scenario: Secondary-side DC output (12–15 V) of medical-grade AC/DC adapter feeding analog front-end circuits. IC Role / Device Role / Timing Role: Parallel-connected TVS on each output rail to suppress coupling noise and external surge ingress via shared chassis ground. Use Value: 5 µA max leakage avoids loading precision voltage references; 175 °C TJ rating supports operation inside sealed enclosures with limited airflow. |
Use Scenario: 12 V sensor supply line feeding Hall-effect position sensors in BCM, exposed to battery transients per ISO 7637-2 Pulse 1/2a. IC Role / Device Role / Timing Role: Cathode tied to sensor VCC rail, anode grounded - clamps negative-going spikes and positive surges simultaneously via system grounding. Use Value: 1500 W rating absorbs ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 40 ms) energy without failure; axial package allows manual rework in dense PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ16A | Surface-mount SMC package; 16 V VRWM; 25.2 V VC @ 43.5 A; lower 600 W peak power | Requires PCB redesign for SMT placement; better suited for space-constrained consumer electronics | Select when board real estate is limited and surge duty is less severe than industrial environments |
| 1.5KE18A | Same manufacturer, identical electrical specs and package; dual part number for same device per JEDEC/ON naming convention | No functional or layout difference - direct cross-reference per datasheet Table 1 | Choose based on distributor stock availability or tape-and-reel vs. bulk packaging preference |
Compared with SMBJ16A, the 1N6277A offers higher surge robustness (1500 W vs. 600 W) and proven axial-lead reliability in high-vibration settings; compared with 1.5KE18A, it is electrically and mechanically identical - differing only in marking and ordering code.
Availability
1N6277A is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication systems, and medical equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N6277A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1N6277A belongs to the Mosorb™ 1500 W TVS family, engineered specifically for high-reliability, cost-effective overvoltage protection in harsh electromagnetic environments where robustness and safety certification are mandatory.
FAQ
What is the maximum clamping voltage of the 1N6277A under rated surge conditions?
The 1N6277A clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 59.5 A (1 ms exponential decay waveform per Figure 5). This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the 1N6277A suitable for bidirectional transient protection?
No, the 1N6277A is strictly unidirectional. It conducts only in reverse bias above VBR and behaves as a standard diode in forward bias. For bidirectional protection, ON Semiconductor offers the 1.5KE18CA (same VRWM and clamping performance but symmetrical in both polarities), which is not interchangeable with the 1N6277A without circuit redesign.
Does the 1N6277A meet UL safety standards for industrial equipment?
Yes, the 1N6277A carries UL 497B recognition (File #116110, Category QVGV2) for isolated loop circuit protection. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown tests - confirming suitability for use in safety-critical industrial control systems where regulatory compliance is required.
What is the thermal resistance and steady-state power rating of the 1N6277A?
The 1N6277A has a junction-to-lead thermal resistance (RJL) of 20 °C/W and a steady-state power dissipation (PD) of 5.0 W at TL ≤ 75 °C with 3/8″ lead length. Power must be derated linearly above 75 °C at 20 mW/°C - meaning at 100 °C lead temperature, PD drops to 4.5 W. This defines safe continuous dissipation limits outside transient conditions.
Can the 1N6277A be used in automotive applications compliant with ISO 7637-2?
Yes, the 1N6277A's 1500 W peak power rating and 25.2 V clamping voltage enable effective suppression of ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 40 ms) and Pulse 2a (−100 V, 2 Ω, 50 ms) transients when properly mounted with short leads near the protected node. Its −65 to +175 °C operating range also satisfies extended automotive temperature requirements.
1N6277A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N6277A FAQ
1.How can I place an order for 1N6277A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6277A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N6277A reliable?
The price and inventory of 1N6277A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6277A is usually 5 days.
3.What payment methods are accepted for 1N6277A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6277A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6277A?
1N6277A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6277A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N6277A?
For technical support, including 1N6277A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6277A requirements.
6.How does Aetrix verify that 1N6277A is sourced from the original manufacturer or authorized distributors?
All 1N6277A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N6277A meets industry standards.
7.What is the process for return or replacement of 1N6277A?
All 1N6277A units undergo pre-shipment inspection (PSI). If there is an issue with 1N6277A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N6277A part is unused and in its original packaging.
Return procedure for 1N6277A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6277A Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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